Improvement in electro-magnetic burglar-alarms



'andy Y guter fihi/@1li l Letters Patent No. 113.036, dated March 2s, 1871.

- IMPROVEMENT IN ELECTRO-MAGNETIC BuRGLAa-ALARMS.

The Schedule referred to in these Letters Patent and making part of the To all whom lit may concern."

Be it known that I, WILSON EFACER, ofthe city and county of Philadelphia and State of Pennsylva-l nia, have invented a new and useful `Electro-Magnetic Indicator" and Burglar-Alaim and .l do hereby declare that the-following is affidi, clear, and. exact description ci' the same, reference being had to the accompanying drawing-and to the letters of reference marked thereon.

The inventionconsists in the use and application of any desired number of `electro-'magnots, with their armatures and levers, each set of magnets being con-v nected by a wire leading through that section or portion ofthe building which that set'is intended torepresent or protect, the operation being not only to indicate or locate the disturbance, but also to give an alarm, when a door or window is opened, byringing the bell attached to the instrument, which continues ringing after the said door, window, Sto., is closed, u'til stopped.

i 0n reference to the accompanying drawing making part of this specification- Figure l is a View of' the indicator;

Figure 2 is a view ofethe alarm; and v Figure Sshowsthc method of' adjusting the stroke I' of the armature-levers.

Similar letters refer to similar parts in the several The indicator A and the alarm B are lixed to the same frame or stand, which is placed at any convenient .point of a building. 01C, figs. 1 and 3, are vibrating armature-levers inl the frames D D.

EE are electronnagnets'or coils placed underthe armatures F and on the tie-pieces G, one pair' of magl net-s to each armature.

H H are levers or arms which depend from the hubs l orcenters oivibration I of the armature-lever C, whose -outer ends are connected with the adjustinghscrews L L', iigs. 1 and 3,pof the frames M, above and below the levers, at or near their outerends; they also make the contact for the -batterycircuit which rings the alarm-bell, and to thaten'd the point of Contact a of the lower screw L is insulated, while the upper one L' basa platina or other contact point, l).

c c are rods which project upwardly from the armature-levers. They serve for depressing the'armatures l ltowithin the attraction ofthe magnets after the current has been broken bythe .opening of a door or window, and formed again by closing the same.

N N are indicator plates-on the outer ends o'f the armature-levers, figs. l and 3. l The ,automatic burglar-alarm, tig. 2, consists of the .hell O'mounted onthe p ost P of the electro-magnet I flame Q.

R-It are electro-magnets fixed horizontally to the' frame Q. Their armature S is fixed to the vibrating,

bell-lever T in the frame'L The bell-lever has its stroke regulated by the insu-4 lated screws Z d of the recessedpicce V of the post W,

a spiral spring, e, one end of which passes through an opening formed in the post W, being attached to the bell-lever T, while 'the other end is xed' tothe tightening-screw or piu Xof the prost Y.

The connection -ot the hammer Z with -the bell-'lever T is by means of a spring, f. When the lever is thrown forwardit strikesagainst the projecting c'nd of the -tbrwardscrcw d.v Byrbeiug' suddenly' brought to a stand the spring is thrown forward, bringing thc ham-v mer Z against the'bell O. Bylthe time the spring reactsthe lereris returned to its original position by thel spiral spring e. The vibration of the lever causes the .bell .to make separate distinct sounds.

The number Vof sets 'of eiectroflnagnelts and attendant parts of the indicator' must correspond with the number of .sections into which the house is divided,

each set being connected with its-own sectioxrby a wire, which is branched oif to form connections with the'windows,`doo1s, Jvc., in that section; as shown in the accompanying drawing, wire number 1 leads from the indicator-battery A to the ground; wire number 2.

leads through thefpost number 3, when 4it afterward divides into as many branches, 4, 5, as there are sets of electro-magnets, with which they connect from these electro-magnets the wires marked 6 and 7 lead' to the several sections B' G', which their respective sets of electro-magnets represent, from which the wires marked '8 and 9 lead to the ground. As longlas the doors and windows or other openings to be protected. remain undisturbed the battery current continues to flow; each set oi'lelectro-magnets, E E, holds down its' Arespective, armaturedcver() O and their armatures F,

the ends of the same bearing upon the'tips-of lthe Y lower or insulated screw L, which'keeps open or broken the battery 1)', known as the alarm-battery.'

lVhen a door or window is opened at any particular section of the house the current which flows through the electro-magnet of that section is broken and its armature released, when the armature-lever instantly tles out of the reachof its electro-magnet@ inliucnce 'by-means of thespiral spring K acting on the depend ing arms or levers H, and forms contact by bearing against the'platina end of the upper adj usting-screw L', and completes the current of the alarm-magnet by Y means of the wire number l0, whichl connects directly with the bell or alarm-battery D'; the wire number 1l connects with the electro-lnagncts 'lt ofthe alarm if wire number 12 connects the lelectro-im'ignets with the antomatio'break. composed oi' the bell-lever l, the

the electro-magnets cease to attract their armature Sg' then the spiral spring e returns the bell-lever F, and brings the eqnalizing-spring E again in contact with l the screw F', which again forms the current.

The bell-lever continues -to vibrate and the bell O to be sounded until the person in charge breaks the current by turning the switch G', which sev'ers the connection of the wire number 13 with the wire number 14 leading to the battery E.

To V again form the current of the indicator the door or window which caused the alarm by being opened must be closed, and the armature-lever O of that seetion must be depressed by means of the rod c until its armature F-coines within the influence or attraction ofthe electro-magnets E of that section. x

The indicating-plates N on the ends of the armature- ]evers designate or locate the disturbance by'being marked with the name or number of the section.

When a section is disturbed its plate raises with the end of its armature-lever, and is thereby readily distinguished from the others.

The tension of spring K, ,which raises the armature-lever O by means ofthe depending arm H, is reg. ulated by the adj usting-screw K'. y

What 1 claim as my invention, and desire to scnre by Letters Patent, is

1. The armature-lever D, frame D, electrfmrmgnets E E, armature F, depending arm or lever H', adjusting and raising-spring and screw K, adjusting-screws L L', and the indicator-plate N, as shown.

structed, arranged, and operated as shown and described. l y 3. rlhe bell-lever T, spring j; and the hammer Z,

as shown and described.

In testimony whereof I'hereunto sign my name', to

DSSGS. u

i WILSON E. FACER.` Witnesses:

`FRANCIS D. PAsronIUs,

JOHN YILLE. y (r.

2. The indicator A and burglar-alarm B, when conthis specification in presence ofV two subscribingesfitf 

